(Until now)

Receive the latest health updates in your inbox

The body’s a funny thing, like a small community filled with organs and other parts that are each central to the functioning of life. We all know facts like that the beating of the heart keeps us alive and that the brain is essentially our internal command station.

But did you know that the extra saliva generated from kissing keeps the mouth clean, aiding in prevention of tooth decay? Or that the lifespan of an eyelash is around 150 days?

Read on for some more interesting, bodily related fun facts:

The average lifespan of an eyebrow hair is three to five months.

The length of the body’s blood vessels, if laid end to end, would wrap around the world twice.

One red blood cell lives approximately 120 days.

The kidneys filter 400 gallons of blood every day.

The thigh bone is stronger than concrete.

The heart of a newborn infant beats 100 to 160 times per minute.

The heart of the average child or adult beats about 60 to 100 times per minute.

Our eyes as adults are the same size as when we were born.

At the age of 35, the average person will begin to lose more than 7,000 brain cells per day -- cells that cannot be replaced.

The brain is composed of more than 80 percent water.

It’s impossible to tickle yourself, because the brain warns the rest of the body of an impending tickle attack that results in the loss of the ticklish sensation.

The smallest bone in the body is the stapes bone, located in the ear.

The human brain has more than 100 billion neurons.

Your ears and nose never stop growing.

Bones are made up of 75 percent water.

Enamel is the hardest substance in the body.

On average, we blink a total of one hour per every 16 hours we are awake.

Humans shed around 600,000 particles of skin every hour. That means we’ll lose 105 pounds of skin by the age of 70.

The face is composed of 14 bones.

Fingernails grow one-tenth of an inch every month.

Fingernails grow faster than toenails, because fingers are exposed more than feet. The nail that grows the fastest is the one on the longest finger of your predominantly used hand.

Nerve impulses to and from the brain travel at the speed equivalent of 170 mph.

A tastebud lasts for only 10 days.

The stomach produces a new layer of mucus every two weeks so that it doesn’t digest itself.

A person engages 72 muscles when speaking.

Babies do not have kneecaps when they are born. Kneecaps develop when a child is around the age range of two to six years old.

It takes around an hour to digest milk.

In proportion to size, the tongue is the strongest muscle housed in the body.

You cannot sneeze with your eyes open.

Well-trained athletes have a heartbeat of 40 to 60 beats per minute.

Humans are born with 300 bones. By adulthood, we only have 206, because joints often fuse together.